Nature and Spirit Beings: Their Activity in our Visible World CW 98: Listener's notes of eighteen lectures held in various cities between 5 November 1907 and 14 June 1908 by Rudolf Steiner. Translated by Christian von Arnim.
1. Lecture 1 The So-called Dangers of Occult Development (Vienna, 6 November 1907)
2. Lecture 2 Esoteric Development and Supersensory Knowledge (Vienna, 7 November 1907)
3. Lecture 3 Rosicrucianism (Dusseldorf, 15 December 1907)
4. Lecture 4 “The Mysteries”A Christmas and Easter Poem by Goethe (Cologne, 25 December 1907)
7. Lecture 7 The Relationship of Human Beings to the World around Them (Nuremberg, 1 December 1907)
8. Lecture 8 The Elemental Kingdoms, their Nature, and Their Actions (Munich, 4 December 1907)
9. Lecture 9 The Human Being’s Relationship with Nature (Stuttgart, 7 December 1907)
10. Lecture 10 The Effects of Some Supersensory Beings on the Human Being (Munich, 15 January 1908)
13. Lecture 13 Some Supersensory Facts and Beings (Stuttgart, 8 February 1908)
14. Lecture 14 Influences from Other Worlds on the Earth (Stuttgart, 11 February 1908)
15. Lecture 15 Earth and Human Development (Munich, 17 March 1908)
16. Lecture 16 The Connections between Worlds and Beings (Munich, 29 April 1908)
17. Lecture 17 Elemental Beings and Other Higher Spiritual Beings (Munich, 14 June 1908)
18. Lecture 18 Beings that Influence the Human Being (Hanover, 24 February 1908 [Brief Notes])